All people hate (if we ignore some buddist monks for the convinience of introductory statement), but hater is a name someone gets for hating something (especially a book, musician, character,...) and than making sure everybody knows s/he does.
Your typical hater will not give you an argumented reason, but will insist on the object of hatred is stupid/ugly/weird.
Haters are often trolls (or trolls are often haters. decide by yourself) and will intentionaly post their opinion where it will couse the most aversion and/or provocation. On Fanpop, that is of course, on the spot where...
OMG! Murtagh is FRIGGN' SEXY!!! Fav. Character. EVAR! I tottally think him and Nasuada should hook up. Of course, if they did my heart would break, and i'm probably a MUCH better kisser than her, but they they suit eachother so well! He so obviously loves her, and she NEEDS some MAN in her life!!!!
Every one i know describe him along the lines of: Cute, dark, hansom, misterious and mother-fu**ing SEXY as HELL!!!
Well that's all folks! Bye! See ya! Toodles! Cheerio! Oh Beat it would ya!!!